I would just go w/ Puppy's first statement...less is better I believe...
I def like where your head is at, and I believe that your proposed statement is spot on...I may be off base in suggesting you do not use it, so ask around.
In my experience, the more I postured (from truth and fact), the more my WAS dug her heels in...that may be the case here as well...
"my patience is not w/o limits" is factual and suggestive...it doesn't come across as threatening- which is what I believe WAH will think of if you say "I can walk away at any time."
